Local privilege escalation via double free
Published Jul 8, 2025 · Updated Feb 13, 2026
Double free in Microsoft Brokering File System on affected Windows builds allows local users to elevate privileges. Microsoft identifies the memory-management error but has not disclosed the affected routine, object lifetime, or attacker-controlled operation that frees the same allocation twice. Successful exploitation requires local low-privileged access and permits privilege elevation, with no remote attack path or user interaction reported.
Summary
What happened
Double free in Microsoft Brokering File System on affected Windows builds allows local users to elevate privileges. Microsoft identifies the memory-management error but has not disclosed the affected routine, object lifetime, or attacker-controlled operation that frees the same allocation twice. Successful exploitation requires local low-privileged access and permits privilege elevation, with no remote attack path or user interaction reported.
The record
- CVE
- CVE-2025-49693
- Published
- Jul 8, 2025
- Updated
- Feb 13, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2025 (Server Core installation)
- Classifications
- CWE-415, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 8, 2025CVE publishedPublication date reported by the CVE source.
- Feb 13, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.26100.0 <10.0.26100.4652
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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